/***************************************************
 * Company	    : Vitalify Asia (VFA Corp.)
 * File		    : DBAdapter.java
 * Create by	: LocNNT
 * Description	: control database on application
 * Create Date	: 10/9/2011
 * Last Update  : 15/10/2011
 ***************************************************/
package com.vfa.fishing.data;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class DBAdapter extends SQLiteOpenHelper {
    private static final int DATABASE_VERSION = 1;
    private static String DB_PATH = "/data/data/com.vfa.fishing/databases/";
    private static String DATABASE_NAME = "gameDB.sqlite";
    protected SQLiteDatabase myDataBase;
    private final Context myContext;
    private Cursor result = null;

    public DBAdapter(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        this.myContext = context;
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        Log.e("cannc-DataHelper",
                "onCreated OpenHelper - Database is created.!");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        onCreate(db);

    }
    /**
     * Creates a empty database on the system and rewrites it with your own
     * database.
     * By calling this method and empty database will be created into the default system path
     * of your application so we are gonna be able to overwrite that atabase with our database.
     * */
    public void createDataBase() throws IOException {

        boolean dbExist = checkDataBase();

        if (dbExist) {
            // do nothing - database already exist
            Log.e("LocNNT", " - Database is exist!");
        } else {
            this.getReadableDatabase().close();
            try {
                copyDataBase();
            } catch (IOException e) {
                throw new Error("Error copying database");
            }
        }
    }

    /**
     * Check if the database already exist to avoid re-copying the file each
     * time you open the application.
     * @return true if it exists, false if it doesn't
     */
    private boolean checkDataBase() {
        SQLiteDatabase checkDB = null;
        try {
            String myPath = DB_PATH + DATABASE_NAME;
            checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
        } catch (SQLiteException e) {
        }
        if (checkDB != null) {
            checkDB.close();
        }
        return checkDB != null ? true : false;
    }

    /**
     * Copies your database from your local assets-folder to the just created
     * empty database in the system folder, from where it can be accessed and
     * handled. This is done by transfering bytestream.
     * */
    private void copyDataBase() throws IOException {
        InputStream myInput = myContext.getAssets().open(DATABASE_NAME);
        String outFileName = DB_PATH + DATABASE_NAME;
        OutputStream myOutput = new FileOutputStream(outFileName);
        byte[] buffer = new byte[1024];
        int length;
        while ((length = myInput.read(buffer)) > 0) {
            myOutput.write(buffer, 0, length);
        }
        // Close the streams
        myOutput.flush();
        myOutput.close();
        myInput.close();
    }

    public Cursor Query(String sql) {
        result = null;
        try {
            result = myDataBase.rawQuery(sql, null);
        } catch (SQLiteException ex) {
            Log.d("Data", "Error when query string :" + sql);
        }
        return result;
    }

    public void execSQL(String sql) {
        try {
            myDataBase.execSQL(sql);
            myDataBase.close();
        } catch (SQLiteException ex) {
            Log.d("trungtt", "Error when exec sql command:[" + sql + "] :"
                    + ex.toString());
        }
    }

    public void openDataBase() throws SQLException {
        if (myDataBase != null && myDataBase.isOpen()) {
            return;
        } else {
            // Open the database
            String myPath = DB_PATH + DATABASE_NAME;
            myDataBase = SQLiteDatabase.openDatabase(myPath, null,
                    SQLiteDatabase.OPEN_READWRITE);
        }
    }

    @Override
    public synchronized void close() {
        if (myDataBase != null)
            myDataBase.close();
        super.close();
    }

}
